Key result
Ionizing radiation alters myocyte calcium handling, promoting low-dose arrhythmias and high-dose anti-arrhythmic reprogramming.
Why the study?
Radiation-induced cardiac dysfunction is now recognized to originate from direct myocyte perturbations rather than just microvascular injury and fibrosis, requiring synthesis of underlying mechanisms.
Design
Review
Authors
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May warrant arrhythmia monitoring after radiation exposure; extends rationale for targeted anti-arrhythmic radiotherapy.
The review highlights how varying doses of ionizing radiation distinctly alter cardiomyocyte calcium handling, ion channel regulation, and mitochondrial energetics, leading to either pro-arrhythmic toxicity or anti-arrhythmic therapeutic effects.
Zukowski et al. (2026) studied this question. Ionizing radiation directly perturbs myocyte calcium handling and mitochondrial energetics, with low doses promoting arrhythmias and high doses inducing anti-arrhythmic electrical reprogramming.
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